Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus.

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No automatic Brightness adjustment after screen replacement

I changed my screen two days ago because of a cracked screen. I already bought not the cheapest replacement kit I could find.

Installing the new screen went great. But I noticed that the screen brightness wouldn't adjust automatically after that. I tried everything I could find online, from re-calibrating the brightness sensor, to turn the feature off, and soft reset the phone. I did not try to reset all my settings because that's what I'd like to keep.

Does anyone has a new idea?

I don't mind opening the phone up again to solve it.

Answered! View the answer I have this problem too

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Your ambient light sensor is either bad or wasn't reinstalled correctly. Step 24 in this guide: iPhone 6 Front Panel Replacement

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Comments:

I bought an completely new display unit. Does it mean the display does not have a brightness sensor built in? And I have to replace it with the old one that worked in my broken display?

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I have no way of knowing if your display has a brightness sensor built in. Where did you buy the display from? Is everything else (earpiece speaker, camera, etc) there? The brightness sensor is part of the camera flex cable.

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In fact, it was the brightness sensor built into the new display. I changed the camera flex cable with the original one and it works perfectly fine now.

Thanks a lot.

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Kevin K will be eternally grateful.
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